Copying machine equipped with synchronous exposing mechanism

ABSTRACT

A copying machine specially adapted to cause both an original and a sensitive paper to reach their respective exposing sections synchronously. The machine then cuts the sensitive paper to the same length as the original. The machine includes first and second original detecting members respectively located immediately upstream of, and at an upstream end of, the original exposing section alongside a passageway for transferring the original, a synchronously transferring roller immediately upstream of said first original detecting member, and a sensitive paper detecting member provided immediately upstream of a sensitive paper exposing section alongside a passageway for transferring the sensitive paper. The supply of sensitive paper is started when the leading edge of the original has reached the second original detecting member and the sensitive paper is cut when the rear edge of the original passes the first original detecting member. The synchronously transferring roller stops rotating when the leading edge of the original has reached the first original detecting member and resumes rotating when the leading edge of the sensitive paper has reached the sensitive paper detecting member.

United States Patent [1 1 Washio et al.

[ Feb. 11, 1975 COPYING MACHINE EQUIPPED WITH SYNCIIRONOUS EXPOSINGMECHANISM [75] Inventors: Takaji Washio; Tatsuo Aizawa, both of Osaka,Japan [73] Assignee: Mita Industrial Co. Ltd., Osaka,

Japan [22] Filed: June 12, 1973 [21] Appl. No.: 369,177

Primary Examiner-Richard A. Wintercorn Attorney, Agent, or FirmSherman &Shalloway [57] ABSTRACT A copying machine specially adapted to causeboth an original and a sensitive paper to reach their respectiveexposing sections synchronously. The machine then cuts the sensitivepaper to the same length as the original. The machine includes first andsecond original detecting members respectively located immediatelyupstream of, and at an upstream end of, the original exposing sectionalongside a passageway for transferring the original, a synchronouslytransferring roller immediately upstream of said first originaldetecting memher, and a sensitive paper detecting member providedimmediately upstream of a sensitive paper exposing section alongside apassageway for transferring the sensitive paper. The supply of sensitivepaper is started when the leading edge of the original has reached thesecond original detecting member and the sensitive paper is cut when therear edge of the original passes the first original detecting member.The synchronously transferring roller stops rotating when the leadingedge of the original has reached the first original detecting member andresumes rotating when the leading edge of the sensitive paper hasreached the sensitive paper detecting member.

10 Claims, 3 Drawing Figures PATENTEU FEB] 1 75 SHEET 2 BF 2 COPYINGMACHINE EQUIPPED WITH SYNCHRONOUS EXPOSING MECHANISM This inventionrelates to a copying machine equipped with a mechanism for synchronouslyexposing an original and a sensitive paper automatically fed from a rollof sensitive paper, and more specifically to a device for causing boththe original and the roll of sensitive paper to reach the respectiveexposing sections through the respective transfer passageways with exactsynchronization, and cutting the roll of paper to the same length as theoriginal.

Copying machines of the conventional type wherein sensitive paper isautomatically supplied from a roll are constructed such that an originaldetecting switch is provided in the inlet of an original-transferringpassageway, and the transfer speeds both at the original transferringpassageway and at a sensitive paper transferring passageway are equalbecause the distance between the original-feed inlet and the center ofan originalexposing section is equal to the distance between thesensitive paper cutting position and the center of a sensitive paperexposing section. In operation, when the original pushes theoriginal-detecting switch at the feed inlet, the supply of the sensitivepaper is started, and both the original and the sensitive paper reachthe respective exposing sections synchronously; Thesensitive paperhaving the same length as the original can be obtained by cutting a rollof the sensitive paper whenthe rear end of the original has passed theoriginaldetecting switch and the switch has returned.

However, in these conventional copying machines, the non-synchronizationbetween the original and the sensitive paper or the non-correspondencebetween the length of the sensitive paper and that of the originaloccurs when the speed of feeding the original to the inlet fed at aspeed slower than the speed of transferring the sensitive paper, thesensitivepaper reaches the exposing section faster than the original,and the roll of the sensitive paper is cut; to a length longer than theoriginal.

With a view to remedying this defect, it was conceived to provide a pairof nip rollers ahead of the original detecting switch, which feed theoriginal at the same speed as the speed of transferring the sensitivepaper. However, the provision of the nip rollers lengthens the originaltransferring passageway, and tends to enlarge the dimensions of theapparatus as a whole;

Furthermore, in copying machines of the conventional type in which aroll of sensitive paper and a sheet of sensitive paper are selectivelyutilized, it is necessary to make the distance between the feed end ofthe sheetlike sensitive paper and the center of the sensitivepaper-exposing seciton to correspond with the distance between theoriginal feed end and the center of the original-exposing section forsynchronous exposure,

and there is the defect that the apparatus becomes larger.

An object of this invention is to provide a copying machine equippedwith a synchronizing mechanism for 5 exposure and cutting whereby anoriginal and a roll of sensitive paper can synchronously reach originaland sensitive paper exposing sections respectively and the roll ofsensitive paper can be cut to the same length as the original,irrespective of the speed at which the original is fed by hand andwithout the provision of nip rollers.

Another object of this invention is to provide a relatively compactcopying machine in which a roll of sensitive paper and a sheet-likesensitive paper can be selectively used.

According to the present invention, there is provided a copying machinecomprising a passageway for transferring an original, an originalexposing section located alongside the transferring passageway forexposing the original, a mechanism for transferring the original at apredetermined speed through said original exposing section, a firstoriginal detecting'member provided near the upstream end of saidoriginal transferring passageway, a second original detecting memberprovided upstream of said original exposing section, and a transferringrollerfor synchronization provided between said first and secondoriginal-detecting members; a'p'assageway for transferring a roll ofsensitive paper, a sensitive paper exposing secition located alongsidethe transferring passageway for exposing the sensitive paper, amechanism for transferring the sensitive paper through thetransferringpassageway at the same'speed as that of'transferring theoriginal,.a sensitive paper detecting member provided upstream of saidsensitive paperexposing section, a feed mechanism provided at anupstream end of said sensitive paper transferring passageway fordelivering the roll of sensitive paper, and a cuttingmechanism forcutting a roll of the sensitive paper delivered by said feed mechanism;the distance between thecenter of said original exposing section andsaid first original detecting member being equal to that between thecenter of said sensitive paper exposing sectionand the position at whichto cut the roll of sensitive paper, aaid sensitive paper-feed mechanismbeginning to feed thesensitive paper when the forward end of theoriginal 'has reached said second original detecting member and ceasingto supply it when the rear end of the original has passed said firstoriginal detecting member, said paper cutting mechanism cuttingthesensitive paper when the rear end of the original has passed thefirst originaldetecting member and said synchronizationtransferringroller ceasing to rotate when the forward end of the original hasreached said second original detecting member and resuming its rotationwhen the forward end of the sensitive paper has reached said sensitivepaper detecting member.

Other objects of this invention will become apparent from the followingdescription taken with the accompanying drawings in which:

FIG. 1 is a sketch of a copying apparatus in accordance with thisinvention;

FIG. 2 is'a circuit diagram for controlling the synchronization ofexposure and cutting in the copying machine shown in FIG. I; and

FIG. 3 is a sketch of a part of the copying machine in its modifiedform.

Referring to FIG. 1 which'shows an electrophotographic copying machineequipped with a synchronizing mechanism for exposure and cutting, thecopying machine A includes an original transferring mechanism,.'anautomatic mechanism for supplyingand cutting sensitive paper, asensitive paper transferring mechanism, and an optical system forexposure.

The original transferring mechanism consists of a plurality of driventransfer rollers 6 for transferring an original from an original-feedingend 4 through an original-exposing section 5 equipped with a transparentplate and a transfer assisting member 2 having a transferring roller 3for synchronization and a follow-up roller 6 which are capable of beingremoved when a thick original is transferred. The sensitive paperfeeding mechanism consists of a removable roll of sensitive paper 1, andfeed rollers 7-7 for feeding seisitive paper with an electromagneticclutch 7 The paper feeding mechanism also includes a cutting mechanism 8which includes a solenoid operated blade. The sensitive papertransferring mechanism includes a plurality of driven rollers 12 fortransferring sensitive paper, delivered from the feed rollers 7, at thesame speed that the original is transferred through a charging device 9.The sensitive paper transfer mechanism also includes an exposing section10 equipped with a transparent plate, a developing device 11 and adrying and fixing section 13. The exposing optical system forprojecting. an optical image of the original on the surface of thesensitive paper is composed of a map 14, reflective mirrors l5 and 17and an in-mirror lens 16. g

A detecting member S, is provided substantially at the upstream end ofthe original transferring passageway in order to control the cutting ofthe sensitive paper. The transfer passageways for the original and thesensitive paper are formed so that the distance from the detectingmember S, to the center of the original exposing section 5 is equal tothe distance L, from the paper roll cutting position (the operatingposition of the cutting mechanism 8) to the center of the sensitivepaper exposing section 10. In order to expose the original and thesensitive paper synchronously, a detecting member S, is providedupstream of the center of the original exposing section 5 along theoriginal transferring passageway by the distance I, and thesynchronization transferring roller 3 is provided between the detectingmembers S, and 8,. Furthermore, along the sensitive paper transferringpassageway, a sensitive paper detecting member S, is provided upstreamof the center of the sensitive paper exposing section 10 along thesensitive paper transferring passageway by the distance 1' equal to thedistance I.

The detecting member S, may be of an arbitrary type, for example amicroswitch, which detects the passage of the rear end of the originaland generates a signal. The detecting members S, and 8, may be of anytype, for example, a microswitch, which detects the arrival of theforward ends of the original and the sensitive paper respectively, andgenerates a signal. The synchronization transferring roller 3 includes amagnetic clutch 3', and by a signal from the detecting member 8,, canstop rotating independently of the driven transfer rollers 6..

The distance between the detecting members S, and S, is preferablyminimized because it defines the minimum length of the original withwhich the synchronization of cutting can be made.

The operation of the cutting andexposure synchronizing mechanism is asfollows: When an original is fed by hand from the feed inlet end 4 andthe forward end of the original pushes the detecting member 8,, theelectromagnetic clutch 3' is actuated by an putput signal from thedetecting member 8,, and the synchronization transferring roller 3begins to rotate. The roller 3 may also be rotated, for example, by amain switch of the copying machine independently of the detecting member8,. I

When the forward end of the original passes the roller 3 and reaches thedetecting member 8,, the electromagnetic clutch 3 becomes inoperative bya signal from the detecting member S,,.whereupon the roller 3 stopsrotating, and the transfer of the original is interrupted.Simultaneously, the electromagnetic clutch 7' is actuated by the signalfrom the detecting member 5,, whereupon the pair offeed rollers 7 beginto rotate and the supply of sensitive paper from the paper roll 1begins. The original should have at least a length such that when itsforward end reaches the detecting member 8-,, the rear end has not yetpassed the detecting member S1 When thesensitive paper fed istransferred by the driven rollers 12 and reaches the detecting member5,, the electromagnetic clutch 3' is again operated by a signal from thedetecting member 8, and the synchronizing transfer roller 3 again beginsto rotate. Since the distance I between the detecting member S and thecenter of the original exposing section 5 is equal to the distance 1'between the detecting member 8;, and the center of the sensitivepaper-exposing section 10, the forward ends of the original and thesensitive paper arrive respectively at the exposing sections5 and 10synchronously. Furthermore, when the rear end of the original passes thedetecting member 8,, the electromagnetic clutch 7 becomes inoperative bya return signal from the detecting member 8,, and the rollers 7 stoprotating. At the same time, the cutting mechanism 8 is actuated to cut aroll of the sensitive paper. Since the distance between the detectingmembers S, and S, is equal to the distance between the sensitive papercutting position and the detecting member 8, and the forward ends ofthe'original and the sensitive paper respectively pass the detectingmembersS, and S, simultaneously, the sensitive paper is cut exactly tothe same length as the original by a return signal of the detectingmember 8,.

Thus, in accordance with the synchronization control mechanism used inthis invention, the transferring of the original is stopped temporarilyin the state in which its forward end pushes the detecting member 8,,and by a return signal generated when the rear end of the original haspassed the detecting member 8,, the cutting mechanism 8 is actuated.Accordingly, independently of the speed of feeding the original, thesychronization of the cutting of the sensitive paper roll with exposurebecomes possible. It is not necessary therefore to provide nip rollersupstream of the detecting member 8,, and the original transferringpassageway can be relatively shortened.

In the copying machine of this invention, there can be provided amechanism by which both a roll of sensitive paper and a sheet ofsensitive paper can be selectively utilized. In order to use asheet-like sensitive paper, a sensitive paper feeding passage 18 havinga feed inlet opening adjacent to the feed inlet opening of the originaltransferring passageway, a change plate 19 for opening and closing thefeed inlet opening, and a change lever are provided. A suitable switch(not shown) is provided for rendering the sensitive paper feeding andcutting mechanisms inoperable when the change plate 19 fas been removedby operating the lever 20.

In the conventional copying machine in which a sheet-like sensitivepaper is used, the distance L between the original feeding end and thecenter of the original exposing section should be equal to the distanceL between the sheet-like sensitive paper feeding end adjacent to theoriginal feeding end and the center of the sensitive paper exposingsection. Furthermore, in copying, the forward ends of the original andthe sensitive paper should be exactly registered and synchronously fedto the respective feeding ends of the transferring passageways.

In the copying machine of this invention in which a roll of sensitivepaper and a sheet-like sensitive paper can be selectively utilized, thedistance L; between the original feeding end 4 and the center of theoriginal exposing section 5 is equal to the distance L, between thesheet-like sensitive paper feeding end and the center of the sensitiveexposing section 10, or may be shorter than the latter.

When the original is fed into the originaltransferring passageway priorto the transfer of the sheet-like sensitive paper or substantiallysynchronously therewith and the forward end of the original reaches thedetecting member 8,, the synchronization transferring roller 3 stopsuntil the forward end of the sensitive. paper reaches the detectingmember S The distance I between the detecting member S and the center ofthe original exposing section 5 is equalto the distance I between thedetecting member S and the center of the sensitive paper exposingsection 10, and therefore, the original and the sheet-like sensitivepaper reach the respective exposing section synchronously.

One example of an electric circuit for controlling the apparatus of theinvention will be described by referring to FIG. 2.

In this circuit, the. detecting members 8,, S andS consist ofmicroswitches. The c terminals of the switches S andS are connected toan electric source 21. The contact a of the switch S is connected to theterminal 0 of a relay contact r of a magnet relay coil R, and thecontact b of the switch 8,, to the terminal c of the switch S The opencontact a is connected to an exciting coil 7" for controlling the clutch7 of the feed rollers 7 and a rectifier SR. The rectifier SR isconnected to a condenserC and the magnetic relay coil R which areconnected in series. The relay contact r of the magnet relay coil R isconnected to one end of a solenoid coil SL for actuating the cuttingmechanism 8. The normally closed contact b of the switch S and thenormally open contact a of the switch S are both connected to theexciting coil 3" for controlling the clutch 3' of the synchronizationtransferring roller 3.

The operation of this circuit as applied to the electrophotographiccopying machine shown in FIG. 1 will be described hereinafter. Theoriginal first trips the switch 8,, and the normally open contact b ofthe switch S is closed. Current is caused to flow to the solenoid 3"through the normally closed contact b'of the switch S whereupon thetransferring roller 3 begins to rotate.

When the forward end of the original pushes the switch S the normallyclosed contact b is opened, and the open contact a is closed. As aresult, the current flow to the exciting coil 3" is stopped, and theroller 3 stops rotating. Simultaneously, electricity is caused to flowto the exciting coil 7" to rotate the sensitive paper feeding rollers 7,and the feeding of a roll of sensitive paper begins. Furthermore,through the closed contact a of the switch S electricity is caused toflow to the magnet relay coil R, and the relay contact r is closed.

When the sensitive paper advances and its forward end urges the switch Sthe open contact a of the switch S is closed, and electricity is againcaused to flow to the exciting coil 3" to rotate the roller again. Bythis, the advancing of the original is resumed synchronously with thesensitive paper. When the rear end of the original passes the switch 8,,the contact b of the switch S, is opened and the contact a is closed.The relay coil R is maintained in the excited state for a short time bythe action of the condenser C even after the contact b has been opened,and the relay contact r is also in the closed state. The contact a ofthe switch S, is closed immediately after the opening of the contact b,and excites the solenoid SL via the relay contact r. Consequently, thecutting mechanism 8 operates to cut a roll of sensitive paper.

When the rear end of the original passes the switch S and the rear endof the sensitive paper passes the switch S the electrical circuitreturns to the original state as shown in FIG. 2.

FIG. 3 shows a part of a modified copying machine in which to utilize aroll of the sensitive paper. When in the conventional copying apparatus,it is desired to inspect or repair the components parts disclosed alongthe sensitive paper transferring passageway, such as the feed mechanisms1 and 7, the cutting mechanism 8, the charging device 9 or the exposingsection 10, or to remove the jamming of the sensitive paper, theindividual mechanisms should be dismounted, and therefore, such a workis complicated and time-consuming. In the improved copying machine ofthis invention, a part 9' of the charging device 9, a part 10 of thesensitive paper exposing section 10, a part 12 of the sensitive papertransporting roller and a part of the member forming the one side of thefeeding passageway for the sensitive paper and the sensitive paperfeeding mechanisms 1 and 7, the cutting mechanism 8, and the changemechanisms 19 and 20 which are located along one side of thetransferring passageway are mounted on an independent sub-frameSF whichis fixed to the main body of the machine and axially fixed at a supportshaft 30. By dint of such a construction, the copying machine can bedivided along the sensitive paper transferring passageway, and this isvery convenient for'the removal of paper jamming, or the inspection andrepair of the machine.

While the present invention has been described above with regard'to anelectrophotographic copying machine equipped with a synchronizingexposure mechanism, it should be understood that the invention can beapplied to a copying'machine of an arbitrary type in which separatetransferring passageways are provided both for the original and a rollof the sensitive paper.

Furthermore, the charging device, the exposing optical system, thedeveloping device, and the transferring mechanisms for the original andthe sensitive paper are one example of the mode of practice of thecopying machine of this invention, and any known combinations can beused. Thus, it should be noted that the invention is, also applicable toa copying machine in which contact exposure is performed at one commonexposing section, instead of the two separate exposing sections asdescribed in the above embodiment.

What we claimed is:

l. A copying machine comprising a passageway for transferring anoriginal, an original exposing section located alongside thetransferring passageway for exposing the original, a mechanism fortransferring the original at a predetermined speed through said originalexposing section, a first original detecting member provided near theupstream end of said original transferring passageway, a second originaldetecting member provided upstream of said original exposing section anda transferring roller for synchronization provided between said firstand second original detecting members; and a passageway for transferringa roll of sensitive paper, a sensitive paper exposing section locatedalongside the transferring passageway for exposing the sensitive paper,a mechanism for transferring the sensitive paper through thetransferring passageway at the same speed as that of transferring theoriginal, a sensitive paper detecting member provided upstream of saidsensitive paper exposing section, a feed mechanism provided at anupstream end of said sensitive paper transferring passageway fordelivering a roll of the sensitive paper, and a cutting mechanism forcutting the roll of the sensitive paper delievered by said feedmechanism, the distance between the center of said original exposingsection and said first original detecting member being equal to thatbetween the center of said sensitive paper exposing section and theposition at which to cut the sensitive paper roll, the distance betweenthe center of said original exposing section and second originaldetecting member being equal to that between the center of saidsensitive paper exposing section and said sensitive paper detectingmember, said sensitive paer feed mechanism beginning to feed thesensitive paper when the forward end of the original has reached saidsecond original detecting member and ceasing to supply it when the rearend of the original has passed said first original detecting member,said paper cutting mechanism cutting the sensitive paper when the rearend of the original has passed the first original detecting member andsaid synchronization transferring roller ceasing to rotate when theforward end of the original has reached said second original detectingmember and resuming its rotation when the forward end of the sensitivepaper has reached said sensitive paper detecting member.

2. The electrophotographic copying machine of claim 1 which includes aplurality of driven rollers disposed alongside the original transferringpassageway for transferring the original, a transfer assisting membercovering said original transferring passageway and capable of beingremoved when a thick original is transferred, a charging mechanism alongsaid sensitive paper transferring passageway located between thesensitive paper feeding end and the sensitive paper exposing section, adeveloping device provided downstream of said sensitive paper exposingsection, driven rollers along the sensitive paper transferringpassageway for transferring the sensitive paper, and an optical systemfor projecting an image on the original exposing section on thesensitive paper exposing section.

3, The copying machine of claim 1 which further includes a mechanism forselecting the use of a roll of sensitive paper and a sheet-likesensitive paper, said selecting mechanism comprising a passageway forfeeding the sheet-like sensitive paper, a change-over member for openingand closing said feed passageway and means interlocking with thechange-over member for rendering the sensitive paper feed mechanism andthe cutting mechanism inoperative.

4. The copying machine of claim 3 wherein the distance between theoriginal feeding end and the center of the original exposing section isequal'to, or shorter than, the distance between the sheet-like sensitivepaper feeding end and the center of the sensitive paper exposingsection.

5. The copying machine of claim 1 wherein the original detecting membersand the sensitive paper detecting members are composed of microswitches.

6. The copying mechine of claim 1 wherein said synchronization transferroller is equipped with an electromagnetic clutch.

7. The copying machine of claim 1 wherein said sensitive paper feedmechanism consists of feed rollers having an electromagnetic clutch, andthe cutting mechanism consists of a combination of a solenoid and ablade.

8. The electrophotographic copying machine of claim 2 wherein a part ofthe charging device located on one side of the sensitive papertransferring passageway, a part of the sensitive paper exposing section,a part of the driven rollers, the sensitive paper feeding mechanism andthe cutting mechanism are mounted on a sub-frame independently of themain body of the copying machine, said sub-frame being movably mountedon the main body of the copying machine whereby the the copying machineis separable at least along a part of the sensitive paper transferringpassageway.

9. The copying machine of claim 1 wherein said synchronization roller iscontrolled so that it begins to rotate when the forward end of theoriginal touches the first original detecting member.

10. The copying machine of claim 1 wherein the synchronization transferroller begins to rotate by a main switch of the copying machine.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No.3,865,481 Dated February 11, 1975 Inventor(s) Takaji WASHIO ET AL It iscertified that error appears in the above-identified patent and thatsaid Letters Patent are hereby corrected as shown below:

'In column 7,. line 41 thereof: cancel "paer" and substitute papertherefor.

Signed and sealed this 8th day' of April 1975.

. (SEAL) Attest: 1

C. MARSHALL DANN v Commissioner of Patents and Trademarks RUTH C. IIASONAttesting Officer FORM PO-IOSO (10-69) USCOMM-DC 60376-P69 tours..iovmuzuvmamm arm-.uu ism r r UNITED STATES. PATENT OFFICE CERTIFICATEOF CORRECTION Patent N0. 3,865,481 Dated February 11, 1975 Inventor(s)Takaji. WASHIO ET AL It is certified that error appears in theabove-identified patent and that said Letters Patent are herebycorrected as shown below:

In column 7, line 41 thereof: cancel "paer" and substitute papertherefor.

Signed and sealed this 8th day' of April 1975.

. (SEAL) Attest:

C. MARSHALL DANN RUTH C. I IAS ON Commissioner of Patents AttestingOfficer and Trademarks FORM PO-1050 (10-69) USCOMM-DC GOBTG-PBD ll-LS.aovmnmzmnmolmzrmsn um .7

1. A copying machine comprising a passageway for transferring anoriginal, an original exposing section located alongside thetransferring passageway for exposing the original, a mechanism fortransferring the original at a predetermined speed through said originalexposing section, a first original detecting member provided near theupstream end of said original transferring passageway, a second originaldetecting member provided upstream of said original exposing section anda Transferring roller for synchronization provided between said firstand second original detecting members; and a passageway for transferringa roll of sensitive paper, a sensitive paper exposing section locatedalongside the transferring passageway for exposing the sensitive paper,a mechanism for transferring the sensitive paper through thetransferring passageway at the same speed as that of transferring theoriginal, a sensitive paper detecting member provided upstream of saidsensitive paper exposing section, a feed mechanism provided at anupstream end of said sensitive paper transferring passageway fordelivering a roll of the sensitive paper, and a cutting mechanism forcutting the roll of the sensitive paper delievered by said feedmechanism, the distance between the center of said original exposingsection and said first original detecting member being equal to thatbetween the center of said sensitive paper exposing section and theposition at which to cut the sensitive paper roll, the distance betweenthe center of said original exposing section and second originaldetecting member being equal to that between the center of saidsensitive paper exposing section and said sensitive paper detectingmember, said sensitive paer feed mechanism beginning to feed thesensitive paper when the forward end of the original has reached saidsecond original detecting member and ceasing to supply it when the rearend of the original has passed said first original detecting member,said paper cutting mechanism cutting the sensitive paper when the rearend of the original has passed the first original detecting member andsaid synchronization transferring roller ceasing to rotate when theforward end of the original has reached said second original detectingmember and resuming its rotation when the forward end of the sensitivepaper has reached said sensitive paper detecting member.
 2. Theelectrophotographic copying machine of claim 1 which includes aplurality of driven rollers disposed alongside the original transferringpassageway for transferring the original, a transfer assisting membercovering said original transferring passageway and capable of beingremoved when a thick original is transferred, a charging mechanism alongsaid sensitive paper transferring passageway located between thesensitive paper feeding end and the sensitive paper exposing section, adeveloping device provided downstream of said sensitive paper exposingsection, driven rollers along the sensitive paper transferringpassageway for transferring the sensitive paper, and an optical systemfor projecting an image on the original exposing section on thesensitive paper exposing section.
 3. The copying machine of claim 1which further includes a mechanism for selecting the use of a roll ofsensitive paper and a sheet-like sensitive paper, said selectingmechanism comprising a passageway for feeding the sheet-like sensitivepaper, a change-over member for opening and closing said feed passagewayand means interlocking with the change-over member for rendering thesensitive paper feed mechanism and the cutting mechanism inoperative. 4.The copying machine of claim 3 wherein the distance between the originalfeeding end and the center of the original exposing section is equal to,or shorter than, the distance between the sheet-like sensitive paperfeeding end and the center of the sensitive paper exposing section. 5.The copying machine of claim 1 wherein the original detecting membersand the sensitive paper detecting members are composed of microswitches.6. The copying mechine of claim 1 wherein said synchronization transferroller is equipped with an electromagnetic clutch.
 7. The copyingmachine of claim 1 wherein said sensitive paper feed mechanism consistsof feed rollers having an electromagnetic clutch, and the cuttingmechanism consists of a combination of a solenoid and a blade.
 8. Theelectrophotographic copying machine of claim 2 wherein a part of thecharging device located on one Side of the sensitive paper transferringpassageway, a part of the sensitive paper exposing section, a part ofthe driven rollers, the sensitive paper feeding mechanism and thecutting mechanism are mounted on a sub-frame independently of the mainbody of the copying machine, said sub-frame being movably mounted on themain body of the copying machine whereby the the copying machine isseparable at least along a part of the sensitive paper transferringpassageway.
 9. The copying machine of claim 1 wherein saidsynchronization roller is controlled so that it begins to rotate whenthe forward end of the original touches the first original detectingmember.
 10. The copying machine of claim 1 wherein the synchronizationtransfer roller begins to rotate by a main switch of the copyingmachine.